These police actions, which challenge you to justify yourself, are presented to the public as "the next step beyond the general conversations officers have with members of the public every day". It is unclear whether you have to answer questions during a stop-and-account or whether you can remain silent. The same government web page also makes the disturbing claim that "we have seen little evidence of wide-spread disproportionate use. There are indeed some forces where white people are more likely to be stopped than ethnic minorities".
The requirement to record ethnicity has been one of the key changes won by the fallout of the Stephen Lawrence murder inquiry debacle. The Met was described by the Inquiry into the murder investigation as "institutionally racist", and after huge pressure the government introduced the ethnicity requirement to force cops to be more accountable for their racism. That requirement is now being scrapped due to the current political agenda to reduce time cops spend filling in paperwork.
It seems that in this day and age it's not only public services that are being cut. It's also things like ethnic watchdogging of state forces with a well-earned reputation for widespread bullying of ethnic minorities. All this to save some cash. And yet despite the cash-saving agenda, police helicopters still intimidate residential areas at night to the tune of over £1500 per hour in the air. Yet again the cost of the bankers' and politicians' financial crisis is being focused upon minorities and vulnerable groups. We knew that if the tories got in they'd start slashing the responsibilities of the cops, so this was only a matter of time. Unfortunately it seems it is also only the beginning.
[1] http://www.guardian.co.uk/uk/2011/sep/22/police-record-race-stop?newsfeed=true
[2] http://www.dailymail.co.uk/news/article-2040927/Half-police-forces-cease-recording-race-people-stop.html
[3] http://www.homeoffice.gov.uk/police/powers/stop-and-search/
[4] http://www.hampshire.police.uk/NR/rdonlyres/EF6B8CEF-7496-407A-A8E8-EBBFFEB875EB/0/24700.pdf